On Sat, 26 Apr 2008 10:10:46 +0200
Takashi Iwai <tiwai@xxxxxxx> wrote:
> At Fri, 25 Apr 2008 20:45:03 +0300,
> Sergei Steshenko wrote:
> >
> > On Fri, 25 Apr 2008 16:23:06 +0200
> > Takashi Iwai <tiwai@xxxxxxx> wrote:
> >
> > > At Fri, 25 Apr 2008 16:19:38 +0200,
> > > I wrote:
> > > >
> > > > At Thu, 27 Mar 2008 01:58:50 +0100,
> > > > Rene Herman wrote:
> > > > >
> > > > > On 26-03-08 23:57, Bill Unruh wrote:
> > > > >
> > > > > > On Wed, 26 Mar 2008, Helge Fredriksen wrote:
> > > > > >
> > > > > >> Ok, here's what I found out:
> > > > > >>
> > > > > >> Since these cards seem to lack the support for doing frequency conversion in
> > > > > >> HW, you simply need to use the alsa plugin
> > > > > >> plughw instead of hw when referring to the card:
> > > > > >>
> > > > > >> arecord -Dplughw:0 test.wav
> > > > > >> aplay -Dplughw:0 test.wav
> > > > > >
> > > > > > AFAIK, alsa frequency conversion is pretty primative ( linear
> > > > > > interpolation) which produces a huge amount of noise/distortion.
> > > > >
> > > > > The default is, but if you install the alsa-plugins package (and
> > > > > libsamplerate) and add a line
> > > > >
> > > > > defaults.pcm.rate_converter "samplerate"
> > > >
> > > > Or "speexrate". This is usually much faster.
> > >
> > > And forgot to write: you don't have to add anything to asoundrc for
> > > speexrate plugin. Install it, then alsa-lib will pick it up
> > > automatically.
> > >
> > >
> > > Takashi
> > >
> >
> > After some web search I see that there are several quality settings for
> > "speexrate".
> >
> > How does one choose/change the quality settings ?
>
> Use "speexrate_best" instead of "speexrate", for example.
> See alsa-plugins/doc/speexrate.txt for details.
>
>
> Takashi
>
Thanks.
I've just read
/usr/share/doc/packages/alsa-plugins/speexrate.txt
file and I understand its contents, specifically, the
"
Or, more easily, define a global variable "defaults.pcm.rate_converter",
which is used as the default converter type by plug and rate plugins:
defaults.pcm.rate_converter "speexrate"
Write the above in your ~/.asoundrc or /etc/asound.conf.
"
part this way:
I can edit /etc/asound.conf file and add, say,
defaults.pcm.rate_converter "speexrate_best"
line anywhere in the /etc/asound.conf file,
Is this understanding correct ?
I read the file on my SUSE 10.3. laptop, hope it's good enough version.
...
I've just discovered there is no /etc/asound.conf file on my laptop:
"
sergei@z61m:~> ls /etc/asound*
/etc/asound.state
sergei@z61m:~>
".
Should I create /etc/asound.conf ? Should it contain just one
defaults.pcm.rate_converter "speexrate_best"
line ?
Thanks,
Sergei.
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